If a octopus can blend into its background almost perfectly.. Why cant we use that technology in our lives? Military, scientific, etc..

Sep 26 2012:
It's not cost effective for military operations. And it really doesn't serve a usefull purpose with today's weapons technology.

As John mentioned, it has been replicated, but is only effective if the "target" is not moving. Military operations require mobility, and once the target starts moving it can be tracked. So even if it stops again and tries to "hide", if the enemy knows where it stopped, you can still "shoot" it.

If an octopus's predator was watching the octopus before it stopped, then the octopus "disappeared", the predator could still swim over to it and kill it.